function getXMLHttp()
{
  var xmlHttp

  try
  {
    //Firefox, Opera 8.0+, Safari
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    //Internet Explorer
    try
    {
      xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch(e)
    {
      try
      {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch(e)
      {
        alert("Your browser does not support AJAX!")
        return false;
      }
    }
  }
  return xmlHttp;
}

function MakeLoginRequest()
{
  var xmlHttp = getXMLHttp();
    
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleLoginResponse(xmlHttp.responseText);
    }
  }

  xmlHttp.open("POST", "grol-weblogin.php", true); 
  xmlHttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
  xmlHttp.send("grolusername=" + document.getElementById("grolusername").value + "&grolpassword=" + document.getElementById("grolpassword").value + "&login=" + document.getElementById("login").value + "&product_name=" + document.getElementById("product_name").value);
  //xmlHttp.send(null);

}
function MakeLogoutRequest()
{
  var xmlHttp = getXMLHttp();
    
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleLogoutResponse(xmlHttp.responseText);
    }
  }

  xmlHttp.open("POST", "grol-weblogin.php", true); 
  xmlHttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
  xmlHttp.send("logout=yes");
}

function HandleLoginResponse(response)
{
  document.getElementById('LoginDiv').innerHTML = response;
  location.reload(true);
}

function HandleLogoutResponse(response)
{
  document.getElementById('LoginDiv').innerHTML = response;
  location.reload(true);
}

function KeyDownHandler(btn)
{
  // process only the Enter key
  if (event.keyCode == 13) {
    // cancel the default submit
    event.returnValue=false;
    event.cancel = true;
    // submit the form by programmatically clicking the specified button
    btn.click();
  }
}